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It sounds like your alternator is bad. East way to confirm, take it to local auto parts store (IE: Autozone, Advance, etc) and have them do a FREE charging system test. Couple of thoughts; you have two new batteries and your poor alternator has to work twice as hard. After you put new batteries in, you've been running on straight battery power. Alternator normally runs all your electronics and recharges battery(s) but if Alt has gone "south" then you're on straight battery power.

alternator gone bad, 100%. as the voltage starts dropping, all the lights on the dash will go crazy because the electronics cannot perform their self diagnostics, as they do not have sufficient voltage.

Check your connections for tightness and corrosion. A corroded battery cable/post will diminish the current going to the dead battery.

Check jumper connections

Dead battery; the worse off the battery is, the more time it will take to charge the battery sufficiently enough to start the car; a completely dead battery with bad cells will never recharge sufficiently enough to hold a charge and start the car on a regular basis

the battery says 12 volts but may be dropping to 4 or 5 under a load...i would suggest jumpstarting the car and see what happens.the battery should read in the high 12 volts and not less than 9.5 under cranking. the dash lights go out on your car when starting,and the alarm will go off ,and disable the ignition if the voltage is too low in cranking the car because the computer will shut it down and activate the anti theft.....check your battery posts are tight. best of luck